index = null;
if (childIndexParameter != null)
	index = (String) uriParameters.get(
					childIndexParameter);
else
	index = (String) uriParameters.get("index");

if(index != null){
	try{
		Integer ix = Integer.valueOf(index);
		
		if(ix <= 0 )
		throw new SimpleException("List Index must be 1 or greater.");
		
	}catch(Throwable t)
	{
		throw new SimpleException("Invalid list index format");
	}

}
